MANCHESTER, UNITED KINGDOM - MAY 09: A fan waves a Roy Keane flag before the Roy Keane Testimonial match between Manchester United and Celtic at Old Trafford on May 9, 2006 in Manchester, England. (Photo by Laurence Griffiths/Getty Images)

MANCHESTER, UNITED KINGDOM - MAY 09:  A fan waves a Roy Keane flag before the Roy Keane Testimonial match between Manchester United and Celtic at Old Trafford on May 9, 2006 in Manchester, England.  (Photo by Laurence Griffiths/Getty Images)